<template>
    <div class="sidebar">
        <el-menu
            class="sidebar-el-menu"
            :default-active="onRoutes"
            :collapse="collapse"
            background-color="#324157"
            text-color="#bfcbd9"
            active-text-color="#20a0ff"
            unique-opened
            router
        >
            <template v-for="item in items">
                <template v-if="item.childMenus !== undefined && item.childMenus.length > 0">
                    <el-submenu :index="item.sysName" :key="item.sysName">
                        <template slot="title">
                            <i :class="item.icon"></i>
                            <span slot="title">{{ item.name }}</span>
                        </template>
                        <template v-for="subItem in item.childMenus">
                            <el-submenu
                                v-if="subItem.childMenus"
                                :index="subItem.sysName"
                                :key="subItem.sysName"
                            >
                                <template slot="title">{{ subItem.name }}</template>
                                <el-menu-item
                                    v-for="(threeItem,i) in subItem.childMenus"
                                    :key="i"
                                    :index="threeItem.sysName"
                                    :route="{ path: threeItem.sysName, query: { name: threeItem.sysName } }"
                                >{{ threeItem.name }}</el-menu-item>
                            </el-submenu>
                            <el-menu-item
                                v-else
                                :index="subItem.sysName"
                                :key="subItem.sysName"
                                :route="{ path: subItem.sysName, query: { name: subItem.sysName } }"
                            >{{ subItem.name }}</el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.sysName" :key="item.sysName">
                        <i :class="item.icon"></i>
                        <span slot="title">{{ item.name}}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
import bus from '../common/bus';
import { selectMenu } from '../../api/sidebar';
export default {
    data() {
        return {
            collapse: false,
            dateKey: new Date(),
            items: [
                {
                    icon: 'el-icon-lx-home',
                    sysName: 'dashboard',
                    name: '系统首页',
                },
            ]
        };
    },
    computed: {
        onRoutes() {
            return this.$route.path.replace('/', '');
        }
    },
    methods:{
        // 查询菜单列表
        _selectMenu() {
            selectMenu({}).then(data => {
                var menus = this.items
                for (var i =0 ;i <data.length ; i++){
                    menus.push(data[i])
                }
                this.items = menus;
            }).catch(error => {
                // 查询失败
            })
        }
    },
    mounted() {
        this._selectMenu();
    },
    created() {
        // 通过 Event Bus 进行组件间通信，来折叠侧边栏
        bus.$on('collapse', msg => {
            this.collapse = msg;
            bus.$emit('collapse-content', msg);
        });
    }
};
</script>

<style scoped>
.sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
    width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
    width: 250px;
}
.sidebar > ul {
    height: 100%;
}
</style>
